I’m guessing that your FS agreement does not cover every eventuality that might arise, though hopefully does have some general language that allows you, comfortably, to exercise your variance power. At a minimum, you could freeze their account, ie. not allow them to spend money until this is resolved. Also, if you don’t sign the representation agreement with the attorney, the attorney cannot be engaged. It may be the case that the attorney is not aware this is a Model A sponsored project and might need to be informed of that fact. So much fun!!